The document discusses noise pollution and its effects. It defines sound and noise, and explains that noise is unwanted sound. It describes how noise is measured in decibel units and lists decibel levels of common noise sources. Transportation vehicles and construction equipment are identified as major sources of noise pollution. The health effects of noise pollution discussed include annoyance, aggression, hypertension, hearing loss, and cardiovascular issues. Strategies for mitigating noise pollution include noise barriers, limiting vehicle speeds, altering road surfaces, and computer modeling of noise.